Page 1 of 17 12311 ... LastLast
Results 1 to 10 of 167

Thread: YFZ450 Jetting .

Hybrid View

  1. #1
    Join Date
    Oct 2002
    Location
    Sudbury, Ontario, Canada
    Posts
    11,007

    Sticky This Maybe !?!?!

    I'm wondering if a Moderator would be able to sticky something liek this for us . How about we set up what everyone is running for their jetting in the YFZ450 . I know it's a pain in the butt to have to search all over to find the answers . It's just a suggestion and I'm sure it would help a lot of people out , as well as stop a lot of threads about jetting info .... it could be like a one stop shop for jetting .

    Anyways here's my setup ...

    Full Curtis Sparks stainless steel exhaust with Sparks Racing filter and adapter (no airbox lid) , along with Sparks racing jet kit .

    Approx . 1000 feet above sea level
    Temperature between 65 - 80 F with an average of 72F

    45 Pilot jet
    178 Main jet ( cuz it's cold right now)
    NCVQ needle with clip on middle setting
    2 1/2 turns out on the fuel screw

    These settings seems to be fine for now ... but has a little bit of popping on de-accel . Could be caused by the cold temps ??
    2004 Yamaha Grizzly 660 .... Loaded !!!!

    Working Together Towards A Common Goal --- Quitting Time !!

    http://www.youtube.com/watch?v=Yx75Zoa_kVw&feature=related

  2. #2
    Join Date
    Nov 2002
    Location
    Lancaster, Wisconsin
    Posts
    2,037
    GYTR Aluminum Slip-on
    168 M
    45 P
    4th clip on NVCQ needle
    2 turns out on fuel screw
    GYTR Foam filter, no air box lid

  3. #3
    Join Date
    Feb 2004
    Location
    Tunkhannock. PA.
    Posts
    339
    DR.D pipe

    172 main
    45 pilot
    4th nvcq needle
    2 1/4 turns fuel screw

    K&N air filter no lid
    2005 D6 PA.State Harescramble Series open C class Champion. and D6 overall Champ

    2006 Open B 3 third place in Pa and in D6

    District 6 XC #34

    06 YFZ 450
    2007 Sponsors
    MSR / DR.D, Duback Racing Development /GT Thunder/ Houser Racing / Hiper technology / /BDATV club/Cardio Stack/Keystone Outdoor

  4. #4
    Join Date
    Dec 2002
    Location
    TEXAS
    Posts
    1,861
    NCVQ dirtbike needle clip on the middle

    172 main

    45 pilot

    94 octane sunoco fuel or VP 10?

    Sparks full pipe

    Sparks foam filter and Sparks ring
    also ran K&N with pro design intake ring with same jetting.

    I'm in eastern Pa. not positive of the elevation??
    www.wesbolt.com
    www.atvriders.com
    RAGE ATV
    lonestarquadracing.com

  5. #5
    Join Date
    Aug 2003
    Location
    PA
    Posts
    83
    what about the fuel you are using? I would assume that no mention would be pump gas. You should mention what fuel you use if it is race gas or oxigenated gas.

    Also if you know your altitude, mention that.



    Thanks
    2005 yfz450- TT racer (ExtremeDirtTrack)

    96 Banshee Tage 4 head, carb, timing, fmf fatty's, Laeger +2+1, +1 swingarm, PEP ZPS, Lonestar axle and anti-vibe steering stem, steering stabilizer,durablue hubs , stainless braided brake lines, amp link, Pro design air filter, rear beadlocks



    99 400ex (origional owner) #1 in line from the first shipment off the boat. White bros. E-series full exhaust, Edelbrock Quicksilver carb.

  6. #6
    Join Date
    Nov 2002
    Location
    Lancaster, Wisconsin
    Posts
    2,037
    I changed mine lol, the other one kept fouling plugs?

    now im at a
    165m
    42pilot (stock)
    NVCQ 3th clip
    Fuel screw 3 turns out

  7. #7
    Join Date
    Sep 2003
    Location
    West KY
    Posts
    1,401
    i finally got my pipe in, and my jetting felt pretty good, but it was about 30 degrees, so i'll have to lean it up a little when it warms up. i have a Dr. D slip-on, the cam mod, and the air box lid off with the stock filter set-up. i run 93 gas, and my elevation is about 750-1500. my jetting is:

    172 main
    48 pilot
    stock needle in 5th position
    fuel screw about 2.5 turns out
    2005 YAMAHA YFZ450
    +2 HOUSER aarms and steering stem flag, Elka front shocks, LSR axle, Dr. D slip-on, cam mod, AC nerfs and bumper, pro-design kill switch, Pro-Taper bars, One Industries graphics kit, pro-design case saver, PEP chain roller relocator, ebrake blockoff, Zip-ty fuel screw, carbon fiber brake rezzy relocator, 400ex throttle, a lil pc'ing and polishing

    rear shock rebuild soon

    172main, 48pilot, 35 leak, 6th position on stock needle, 2.5 turns out, and a brown spark plug!!

  8. #8
    Join Date
    Oct 2002
    Location
    Sudbury, Ontario, Canada
    Posts
    11,007
    Thanks to everyone who has responded so far ..... but come on you other guys ... post up . Help fellow riders out ... I know there are a LOT more of you guys out there with pipes .... especially when this thread has gotten over 300 views .
    2004 Yamaha Grizzly 660 .... Loaded !!!!

    Working Together Towards A Common Goal --- Quitting Time !!

    http://www.youtube.com/watch?v=Yx75Zoa_kVw&feature=related

  9. #9
    Join Date
    Feb 2004
    Location
    mountaintop
    Posts
    24
    178 main
    45 pilot
    ncvq on 5th
    2 turns on fuel screw
    94 sunoco fuel
    yfz450xc

  10. #10
    Join Date
    Oct 2002
    Location
    Sudbury, Ontario, Canada
    Posts
    11,007
    Originally posted by cdalexct
    178 main
    45 pilot
    ncvq on 5th
    2 turns on fuel screw
    94 sunoco fuel
    Stock pipe ?? airbox lid on or off? Temps ?? Elevation ??
    2004 Yamaha Grizzly 660 .... Loaded !!!!

    Working Together Towards A Common Goal --- Quitting Time !!

    http://www.youtube.com/watch?v=Yx75Zoa_kVw&feature=related

Page 1 of 17 12311 ... LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •